Putter head

ABSTRACT

A putter head includes a head main body that defines a periphery of the putter head, and a bar that crosses a void space of the head main body in a forward-backward direction. The bar is inserted into insertion holes and fixed thereto by an adhesive. A face member is mounted on a recess. A shaft fixing hole is provided to pass through the bar from the top surface of a front portion of the head main body. A shaft is inserted into the shaft fixing hole and fixed thereto by an adhesive.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a putter head of a putter for golf, andin particular, to a putter head that is provided with a void space atits central part and a bar crossing the void space in a forward-backwarddirection.

2. Description of the Related Art

A putter head provided with a void space passing through the centralpart thereof in the thickness direction (vertical direction) and a barcrossing the void space in a forward-backward direction is disclosed inJP-A-2005-66249. By forming the void space, the moment of inertia aboutthe gravity center is increased and the sweet area of the putter head ismade larger. Further, a feeling of hitting sensation is improved byproviding the bar crossing the void space in the forward-backwarddirection.

SUMMARY OF THE INVENTION

The putter head disclosed in JP-A-2005-66249 requires high dimensionalaccuracy in the structure because the bar is integrally formed with theputter head. Accordingly, it is an object of the invention to provide aputter head that can be easily manufactured.

According to JP-A-2005-66249, a shaft fixing hole is formed at the heelside. Thus, it is difficult to transmit a feeling of hitting sensationto a shaft.

It is another object of the invention to provide a putter head that caneasily transmit a feeling of hitting sensation to a shaft.

According to a first aspect of the invention, a putter head includes ashaft fixing hole, a head main body that is provided with a void space,which is a through-hole vertically passing through the head main body atits central part or a concave portion recessed from a top surface of thehead main body, and a bar that crosses the void space in aforward-backward direction. The head main body and bar are separateparts, the bar is inserted into a bar insertion hole extending from afront end surface or a rear end surface of the head main body in theforward-backward direction, and a cover is mounted on the head main bodyto close the bar insertion hole.

According to a second aspect of the invention, the shaft fixing hole isprovided in the bar.

According to a third aspect of the invention, the shaft fixing hole isprovided to pass through the bar from a top surface of the putter head.

According to a fourth aspect of the invention, a recess is formed in thefront end surface of the putter head, the bar insertion hole is formedin a bottom wall of the recess, and a face member as a cover is mountedon the recess.

According to a fifth aspect of the invention, the recess is formed inthe rear end surface of the putter head, the bar insertion hole isformed in a bottom wall of the recess, and a cover is mounted on therecess.

According to a sixth aspect of the invention, colors of the head mainbody and bar are different from each other.

According to a seventh aspect of the invention, a volume of the voidspace is in a range of 8000 to 100000 mm³.

According to an eighth aspect of the invention, a length of the barinside the void space is in a range of 30 to 80 mm.

The putter head according to the aspects of the invention is easilymanufactured because a head and bar are separately manufactured.

According to the aspects of the invention, the shaft fixing hole isprovided in the bar, or is provided to pass through the head main bodyand the bar, so that a feeling of hitting sensation is easilytransmitted to a shaft. In addition, the shaft is inserted into the headmain body and bar and fixed thereto, and thus fixing strength of the barincreases.

According to the aspects of the invention, the recess is formed in thefront end surface of the putter head, the bar insertion hole is formedin the bottom wall of the recess, and the cover, that is, the facemember is mounted on the recess. Therefore, a feeling of hittingsensation is easily transmitted to the shaft.

According to the aspects of the invention, the recess is formed in therear end surface of the putter head, the bar insertion hole is formed inthe bottom wall of the recess, and the cover is mounted on the recess.Therefore, the putter head can be easily manufactured.

According to the aspects of the invention, the head main body and barhave different colors, so that the bar implicitly indicates a back swingdirection and a rolling direction of a ball.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a putter head according to an embodimentof the invention;

FIGS. 2A and 2B are a plan view and a side view of the putter head,respectively;

FIG. 3 is a front view of the putter head;

FIG. 4 is a bottom view of the putter head;

FIG. 5 is a rear view of the putter head; and

FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the invention will now be described in detail withreference to FIGS. 1 to 6.

FIG. 1 is a perspective view of a putter head according to an embodimentof the invention. FIG. 2A is a plan view of the putter head. FIG. 2B isa left side view of the putter head. FIG. 3 is a front view of theputter head. FIG. 4 is a bottom view of the putter head. FIG. 5 is arear view of the putter head. FIG. 6 is a cross-sectional view of theputter head taken along line VI-VI of FIG. 3.

A putter head 10 includes a head main body 20 that defines the outerperiphery of the putter head, and a bar 40 that crosses a void space ofthe head main body 20 in a forward-backward direction.

The head main body 20 has a front portion 21, a tow side portion 22, aheel side portion 23, and a back portion 24 where the tow and heel sideportions 22 and 23 are joined. The tow side portion 22 extends backwardfrom the tow of the front portion 21 to the center of the back portion24 between the tow and heel sides of the putter head. The heel sideportion 23 extends backward from the heel of the front portion 21 to thecenter of the putter head. Therefore, the head main body 20substantially has a triangular frame shape in plan view.

In this embodiment, a substantially triangular void space 25 surroundedby the front portion 21, the side portions 22 and 23, and the backportion 41 is provided. The void space 25 passes through an uppersurface and a lower surface of the head main body 20.

As shown in FIG. 6, a recess 30 is formed in the front surface (face) ofthe head main body. The recess 30 occupies a main area of the face. Thelength of the recess 30 in the toe-heel direction is preferably 35 to 95percent, and particularly, 45 to 90 percent of the length of the face inthe toe-heel direction. Further, the vertical width of the recess 30 ispreferably 70 to 98 percent, particularly, 75 to 95 percent of the widthof the face in the vertical direction. The depth of the recess 30 ispreferably 0.5 mm or more, for example, 2 to 6 mm.

A first insertion hole 31 passes through from a bottom wall 30 a of therecess 30 to the void space 25. A second insertion hole 32 is formed inthe back portion 24 along the extension line of the first insertion hole31. The second insertion hole 32 is recessed from the inside of the voidspace 25, but does not extend to a rear end surface of the head mainbody 20.

The bar 40 is inserted into the insertion holes 31 and 32 and fixedthereto by an adhesive. In this embodiment, the bar 40 is configured tohave a cylindrical solid body and its front end surface is flush withthe bottom wall 30 a of the recess 30.

A face member 50 is attached to the recess 30. The face member 50 may beformed of a material, such as synthetic resin, elastomer, rubber, metal,ceramics, carbon, or the like.

Preferably, the face member 50 is fixed by an adhesive. When the facemember 50 is formed of a metal, the face member can be fixed bycaulking, thermal insert, or cooling insert etc.

A shaft fixing hole 60 is provided in the putter head 10 to pass throughthe bar 40 from the top face of the front portion 21 of the head mainbody 20. A shaft (not shown) is inserted into the shaft fixing hole 60and fixed by adhesive. In this embodiment, the shaft fixing hole 60passes through the bar 40, but does not extend to the bottom of the headmain body 20, so as to form a concavity. The shaft fixing hole 60 has adiameter less than a diameter of the bar 40 and passes through the barlike a through-hole. The axis of the shaft fixing hole 60 is inclinedtoward the heel side as it goes upwards, and preferably crosses the axisof the bar 40.

As shown in FIG. 4, at a plurality of positions of the bottom of thehead main body 20, weights 70 formed of a material with high specificgravity ranging from 7.8 to 12, such as stainless, tungsten,tungsten-nickel alloy, or the like, are fixed to the head main body 20by screwing or caulking. Each of the weights 70 does not protrude fromthe bottom of the head main body 20.

In this embodiment, the head main body 20 and the bar 40 are formed ofan aluminum alloy, not including the weights 70, with specific gravityof 2.7 to 2.8. Further, at least one of the outer surfaces of the headmain body 20 and the bar 40 is anodized, which makes them to havedifferent colors. In particular, it is preferable that the bar 40 iscolored with a dark color, such as blue, and the head main body 20 iscolored with a light color, such as silver, gray, or white.

According to the putter head having the above-described configuration,the head main body 20 and the bar 40 are separate parts and easilymanufactured. Further, assembling of the putter head including theassembly of the head main body 20 and the bar 40 is simplified becausethe bar 40 is inserted into the first and second insertion holes 31 and32 in sequence and the face member 50 is mounted thereafter.

In this embodiment, since the shaft fixing hole 60 is provided to passthrough the head main body 20 and the bar 40, a player can easily feel ahitting sensation through the shaft.

According to this embodiment, since the void space 25 is formed, themoment of inertia of the putter head increases and a hit ball stablyrolls. The volume of the void space 25 (except for the bar 40) ispreferably in a range of 8000 to 100000 mm³, and particularly, 15000 to80000 mm³.

In this embodiment, because the bar 40 crosses the void space 25 in theforward-backward direction, a player can easily estimate a back swingdirection and a rolling direction of a ball. In particular, a playereffectively estimates the directions when the head main body 20 and thebar 40 have different colors.

It is preferable that the axis of the bar 40 has an angle ranging from87 to 93°, and particularly, 90° with respect to the toe-heel directionof the face.

Preferably, the length of the bar 40 inside the void space 25 is in arange of 30 to 80 mm, and the diameter of the bar 40 is in a range of 10to 13 mm. The diameter of the bar 40 is preferably larger than that ofthe shaft fixing hole 60 by 1 mm or more, e.g., in a range of 1 to 5 mm.

The bar 40 is a solid bar, but may be a hollow cylinder. The bar 40 maybe an ellipse column, an ellipse hollow column, a square column or asquare hollow column.

The length of the first insertion hole 31 (the length from the bottomwall 30 a to the void space 25) is preferably in a range of 3 to 25 mm,particularly, 5 to 20 mm. The depth of the second insertion hole 32 ispreferably 3 mm or more, for example, in a range of 3 to 10 mm.

The above-described embodiment is just an example of the invention, andthe invention can include other configurations not shown in thedrawings. For example, an insertion hole passing through a head mainbody from the rear end surface to a central hole may be formed, and abar may be inserted into the insertion hole from the rear side. Inaddition, an opening of the insertion hole at the rear end may be closedby a closing means, such as a cap. The closing means may be fixed by ascrew or an adhesive. An elastic body, such as rubber, may be interposedbetween the bar and the closing means.

In this case, an elastic body, such as rubber, may be interposed betweenthe foremost end of the insertion hole and the bar.

The bar inserted in the insertion hole may be fixed by screwing.

Although the void space 25 is a through-hole that passes through thehead main body in the thickness wise direction in the above-describedembodiment, a hole may be recessed from the top surface and have abottom.

1. A putter head formed with a shaft fixing hole, comprising: a headmain body formed with a void space at its central part; and a bar thatcrosses the void space in a forward-backward direction, wherein the headmain body and the bar are separate parts, the bar is inserted into a barinsertion hole extending from a front end surface or a rear end surfaceof the head main body in the forward-backward direction, and a cover ismounted on the head main body to close the bar insertion hole.
 2. Theputter head according to claim 1, wherein the shaft fixing hole isprovided in the bar.
 3. The putter head according to claim 1, whereinthe shaft fixing hole is provided to pass through the bar from a topsurface of a front portion of the putter head.
 4. The putter headaccording to claim 1, wherein a recess is formed in the front endsurface of the putter head, the bar insertion hole is formed in a bottomwall of the recess, and a face member as the cover is mounted on therecess.
 5. The putter head according to claim 2, wherein a recess isformed in the front end surface of the putter head, the bar insertionhole is formed in a bottom wall of the recess, and a face member as thecover is mounted on the recess.
 6. The putter head according to claim 3,wherein a recess is formed in the front end surface of the putter head,the bar insertion hole is formed in a bottom wall of the recess, and aface member as the cover is mounted on the recess.
 7. The putter headaccording to claim 1, wherein a recess is formed in the rear end surfaceof the putter head, the bar insertion hole is formed in a bottom wall ofthe recess, and the cover is mounted on the recess.
 8. The putter headaccording to claim 2, wherein a recess is formed in the rear end surfaceof the putter head, the bar insertion hole is formed in a bottom wall ofthe recess, and the cover is mounted on the recess.
 9. The putter headaccording to claim 3, wherein a recess is formed in the rear end surfaceof the putter head, the bar insertion hole is formed in a bottom wall ofthe recess, and the cover is mounted on the recess.
 10. The putter headaccording to claim 1, wherein colors of the head main body and the barare different from each other.
 11. The putter head according to claim 1,wherein a volume of the void space is in a range of 8000 to 100000 mm³.12. The putter head according to claim 1, wherein a length of the barinside the void space is in a range of 30 to 80 mm.
 13. The putter headaccording to claim 1, wherein the void space is a through-holevertically passing through the head main body.
 14. The putter headaccording to claim 1, wherein the void space is a concave portionrecessed from a top surface of the head main body.